CVE-2026-89134NVD

Vulnerability Summary

A certificate with no dNSName SAN but another SAN type present (e.g. registeredID or iPAddress) bypassed the Subject CN dNSName name-constraint check. The CN-as-DNS fallback was gated on cert->subjectCN != NULL && cert->altNames == NULL && !cert->isCA instead of "no dNSName SAN", so an out-of-scope CN was accepted. This incomplete fix from CVE-2026-6731, leading to the name-constraint check issue, was introduced in wolfSSL version 5.9.2.

Severity Level

MEDIUM(6.3)

Published Date

Sep 27, 2026

Last Modified

Sep 27, 2026

Exploitation Status

No confirmed exploitation yet

EPSS Score (30-Day)

0.22%Probability

Root Weakness (CWE)

CWE-295: Unknown/Unlisted Weakness ↗

Refer to the official MITRE database for detailed architectural specifications regarding this weakness.

CVSS v4.0 Base Metrics — Score 6.3 (MEDIUM)

Attack VectorNetwork

Attack ComplexityHigh

Attack RequirementsNone

Privileges RequiredNone

User InteractionNone

Confidentiality (Vulnerable System)Low

Integrity (Vulnerable System)Low

Availability (Vulnerable System)None

Confidentiality (Subsequent System)None

Integrity (Subsequent System)None

Availability (Subsequent System)None

Affected & Patched Versions

Affected Versions

wolfSSL wolfSSL >= 5.9.2

Patched Versions

Not provided by cveorg for this CVE.

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